Erinevus lehekülje "ITI0011:praktikum 9 T8" redaktsioonide vahel

Allikas: Kursused
Mine navigeerimisribale Mine otsikasti
 
(ei näidata sama kasutaja üht vahepealset redaktsiooni)
12. rida: 12. rida:
 
* Shapes
 
* Shapes
 
* mouse event
 
* mouse event
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 +
== Koodinäite ==
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 +
<source lang="java">
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import javafx.application.Application;
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import javafx.event.EventHandler;
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import javafx.scene.Node;
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import javafx.scene.Scene;
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import javafx.scene.control.Menu;
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import javafx.scene.control.MenuBar;
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import javafx.scene.control.MenuItem;
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import javafx.scene.input.MouseButton;
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import javafx.scene.input.MouseEvent;
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import javafx.scene.layout.BorderPane;
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import javafx.scene.layout.Pane;
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import javafx.scene.shape.Polyline;
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import javafx.scene.shape.Rectangle;
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import javafx.stage.Stage;
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public class Main extends Application {
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class MyHandler implements EventHandler<MouseEvent> {
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@Override
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public void handle(MouseEvent event) {
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}
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}
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public static void main(String[] args) {
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launch(args);
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}
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private double oldX = 0, oldY = 0;
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@Override
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public void start(Stage primaryStage) throws Exception {
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BorderPane root = new BorderPane();
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Scene scene = new Scene(root, 500, 500);
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primaryStage.setScene(scene);
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primaryStage.show();
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MenuBar menuBar = new MenuBar();
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Menu menuFile = new Menu("File");
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MenuItem menuFileSave = new MenuItem("Save");
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menuBar.getMenus().add(menuFile);
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menuFile.getItems().add(menuFileSave);
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root.setTop(menuBar);
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Pane main = new Pane();
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root.setCenter(main);
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Rectangle r1 = new Rectangle(10, 10, 100, 100);
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Rectangle r2 = new Rectangle(100, 100, 50, 20);
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main.getChildren().add(r1);
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main.getChildren().add(r2);
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//EventHandler<MouseEvent> mouseHandler = new MyHandler();
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EventHandler<MouseEvent> mouseHandler = new EventHandler<MouseEvent>() {
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@Override
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public void handle(MouseEvent event) {
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if (event.getEventType() == MouseEvent.MOUSE_PRESSED) {
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if (event.getButton() == MouseButton.SECONDARY) {
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Polyline line = new Polyline();
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line.getPoints().add(event.getX());
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line.getPoints().add(event.getY());
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main.getChildren().add(line);
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}
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oldX = event.getX();
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} else {
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// drag
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if (event.getButton() == MouseButton.PRIMARY) {
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for (Node s : main.getChildren()) {
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if (s instanceof Rectangle) {
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Rectangle r = (Rectangle)s;
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r.setX(r.getX() + (event.getX() - oldX));
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}
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}
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} else {
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//secondary
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for (Node s : main.getChildren()) {
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if (s instanceof Polyline) {
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Polyline p = (Polyline)s;
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if (p.getPoints().size() < 4) {
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p.getPoints().add(event.getX());
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p.getPoints().add(event.getY());
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} else {
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p.getPoints().set(2, event.getX());
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p.getPoints().set(3, event.getY());
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}
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}
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}
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}
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}
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oldX = event.getX();
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}
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};
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main.setOnMousePressed(mouseHandler);
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main.setOnMouseDragged(mouseHandler);
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}
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}
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</source>
  
 
== Exercise ==
 
== Exercise ==
  
−
Create an application which allows the user to draw rectangles. There are several options how to achieve this:
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Create an application which allows the user to draw a rectangle. There are several options how to achieve this:
 
* using mouse dragging: the starting point is fixed when the dragging starts (mouse press), the opposite corner moves along while dragging. if the dragging ends, the rectangle is fixed.
 
* using mouse dragging: the starting point is fixed when the dragging starts (mouse press), the opposite corner moves along while dragging. if the dragging ends, the rectangle is fixed.
 
* using clicking: when clicking first time, one point is fixed, when clicking another time, the opposite corner is fixed (and rectangle is drawn).
 
* using clicking: when clicking first time, one point is fixed, when clicking another time, the opposite corner is fixed (and rectangle is drawn).
 
* some other way
 
* some other way
  
−
Requirements:
+
Optional requirements:
 
* more than one rectangle can be drawn
 
* more than one rectangle can be drawn

Viimane redaktsioon: 28. oktoober 2014, kell 06:55

Tagasi ITI0011 lehele.

Üldine

Praktikum: 28.10.2014 kell 8:00

Teemad:

Koodinäite

<source lang="java">

import javafx.application.Application; import javafx.event.EventHandler; import javafx.scene.Node; import javafx.scene.Scene; import javafx.scene.control.Menu; import javafx.scene.control.MenuBar; import javafx.scene.control.MenuItem; import javafx.scene.input.MouseButton; import javafx.scene.input.MouseEvent; import javafx.scene.layout.BorderPane; import javafx.scene.layout.Pane; import javafx.scene.shape.Polyline; import javafx.scene.shape.Rectangle; import javafx.stage.Stage;

public class Main extends Application {

class MyHandler implements EventHandler<MouseEvent> {

@Override public void handle(MouseEvent event) {

}

}

public static void main(String[] args) { launch(args); }

private double oldX = 0, oldY = 0; @Override public void start(Stage primaryStage) throws Exception { BorderPane root = new BorderPane();

Scene scene = new Scene(root, 500, 500);

primaryStage.setScene(scene); primaryStage.show();

MenuBar menuBar = new MenuBar(); Menu menuFile = new Menu("File"); MenuItem menuFileSave = new MenuItem("Save"); menuBar.getMenus().add(menuFile); menuFile.getItems().add(menuFileSave);

root.setTop(menuBar);

Pane main = new Pane(); root.setCenter(main);

Rectangle r1 = new Rectangle(10, 10, 100, 100); Rectangle r2 = new Rectangle(100, 100, 50, 20); main.getChildren().add(r1); main.getChildren().add(r2);


//EventHandler<MouseEvent> mouseHandler = new MyHandler(); EventHandler<MouseEvent> mouseHandler = new EventHandler<MouseEvent>() {

@Override public void handle(MouseEvent event) { if (event.getEventType() == MouseEvent.MOUSE_PRESSED) { if (event.getButton() == MouseButton.SECONDARY) { Polyline line = new Polyline(); line.getPoints().add(event.getX()); line.getPoints().add(event.getY()); main.getChildren().add(line); } oldX = event.getX(); } else { // drag if (event.getButton() == MouseButton.PRIMARY) { for (Node s : main.getChildren()) { if (s instanceof Rectangle) { Rectangle r = (Rectangle)s; r.setX(r.getX() + (event.getX() - oldX)); } } } else { //secondary for (Node s : main.getChildren()) { if (s instanceof Polyline) { Polyline p = (Polyline)s; if (p.getPoints().size() < 4) { p.getPoints().add(event.getX()); p.getPoints().add(event.getY()); } else { p.getPoints().set(2, event.getX()); p.getPoints().set(3, event.getY()); } } } } } oldX = event.getX();

} };

main.setOnMousePressed(mouseHandler); main.setOnMouseDragged(mouseHandler); }

}

</source>

Exercise

Create an application which allows the user to draw a rectangle. There are several options how to achieve this:

  • using mouse dragging: the starting point is fixed when the dragging starts (mouse press), the opposite corner moves along while dragging. if the dragging ends, the rectangle is fixed.
  • using clicking: when clicking first time, one point is fixed, when clicking another time, the opposite corner is fixed (and rectangle is drawn).
  • some other way

Optional requirements:

  • more than one rectangle can be drawn
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